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Consider
your work tasks, and your body size and shape, when choosing a chair. A single
size or type of chair is not appropriate for all tasks, and cannot suit all body
shapes and sizes.
When you sit to
perform a task, your spine is most comfortable when
it's in "neutral posture", a slightly reclined
sitting position. The following adjustment options
can help you maintain "neutral posture".
SEAT:
- Height:
Seat height should adjust to fit the height of the
user and/or the work surface.
- Tilt:
The seat should adjust at a variety of angles to
allow for changing positions and postures for different
tasks. A rocking mechanism can provide continuous
active repositioning while working.
- Depth:
The seat should support your hips and legs, and
provide a 1-2" space between the front edge
of the seat and the back of your knees. Sliding
seat options can help you set the proper depth position.
BACKREST:
- Height:
The backrest should adjust up and down to fit the
curves of your spine. Adjustable lumbar support
is often necessary to accommodate flat, average
or deep low back curves.
- Contour:
The backrest of the chair should support
your upper and lower back, while allowing free arm
movement. If you recline, you may need a backrest
that extends up to your shoulders or neck.
- Angle:
The backrest should adjust independently from the
seat tilt to provide optimal support for a variety
of work positions, such as reclining or leaning
forward.
ARMREST:
- Armrest:
Armrests can provide additional upper extremity
and back support when taking breaks or pauses between
writing or keying tasks.
- Height:
If you have armrests, they should be adjustable.
Your forearms should be able to rest on the armrests
with your shoulders relaxed.
- Width:
Inward and outward adjustment provides additional
personal fit. This is especially important with
large and small stature individuals.
- Pivot:
Pivoting armrests provide both width and angle adjustment
of the armrests.
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